Base: Used to create a logarithmic spiral
along with Rotation. The nominal scaling S
becomes baseS-1
unless base is one in which case scaling
remains unchanged. Use a value less than 1 for a converging
spiral and a value greater than 1 for a diverging spiral. A true
logarithmic spiral would use a base
of e = 2.718 (or
1/e = 0.368).
See the Tile Tricks section for examples.

Alternate: Alternate scaling up and
scaling down tiles.

Cumulate: Scaling is cumulative.

The Scale tab of the Tile Clones dialog.

A P1 symmetry tiling with a negative scaling. There is an
−15% x scaling for each column and a −15%
y scaling for each row. The scaling is
a percentage of the base tile bounding box. The spacing between
the center of adjacent tiles remains fixed.

A P1 symmetry tiling with a cumulative negative scaling.
There is a −10% x scaling for each column and a −10% y
scaling for each row.
There is also a −5% x shift for each column and a −5% y shift for each row.
The Cumulate box is checked for both x and y.
A general rule is that to keep scaled tiles just touching, specify a
cumulative shift that is half of the scaling (in percent).